2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
4 * License terms: GNU General Public License (GPL) version 2
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
9 #include <linux/stddef.h>
10 #include <linux/spinlock.h>
11 #include <linux/slab.h>
12 #include <net/caif/caif_layer.h>
13 #include <net/caif/cfpkt.h>
14 #include <net/caif/cfctrl.h>
16 #define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
17 #define UTILITY_NAME_LENGTH 16
18 #define CFPKT_CTRL_PKT_LEN 20
22 static int handle_loop(struct cfctrl *ctrl,
23 int cmd, struct cfpkt *pkt){
27 static int handle_loop(struct cfctrl *ctrl,
28 int cmd, struct cfpkt *pkt);
30 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
31 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
35 struct cflayer *cfctrl_create(void)
37 struct dev_info dev_info;
39 kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
41 pr_warn("Out of memory\n");
44 caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
45 memset(&dev_info, 0, sizeof(dev_info));
47 memset(this, 0, sizeof(*this));
48 cfsrvl_init(&this->serv, 0, &dev_info, false);
49 atomic_set(&this->req_seq_no, 1);
50 atomic_set(&this->rsp_seq_no, 1);
51 this->serv.layer.receive = cfctrl_recv;
52 sprintf(this->serv.layer.name, "ctrl");
53 this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
54 spin_lock_init(&this->loop_linkid_lock);
55 spin_lock_init(&this->info_list_lock);
56 INIT_LIST_HEAD(&this->list);
57 this->loop_linkid = 1;
58 return &this->serv.layer;
61 static bool param_eq(const struct cfctrl_link_param *p1,
62 const struct cfctrl_link_param *p2)
65 p1->linktype == p2->linktype &&
66 p1->priority == p2->priority &&
67 p1->phyid == p2->phyid &&
68 p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
73 switch (p1->linktype) {
76 case CFCTRL_SRV_DATAGRAM:
77 return p1->u.datagram.connid == p2->u.datagram.connid;
80 p1->u.rfm.connid == p2->u.rfm.connid &&
81 strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
84 p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
85 && p1->u.utility.fifosize_bufs ==
86 p2->u.utility.fifosize_bufs
87 && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
88 && p1->u.utility.paramlen == p2->u.utility.paramlen
89 && memcmp(p1->u.utility.params, p2->u.utility.params,
90 p1->u.utility.paramlen) == 0;
92 case CFCTRL_SRV_VIDEO:
93 return p1->u.video.connid == p2->u.video.connid;
104 static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
105 const struct cfctrl_request_info *r2)
107 if (r1->cmd != r2->cmd)
109 if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
110 return param_eq(&r1->param, &r2->param);
112 return r1->channel_id == r2->channel_id;
115 /* Insert request at the end */
116 static void cfctrl_insert_req(struct cfctrl *ctrl,
117 struct cfctrl_request_info *req)
119 spin_lock(&ctrl->info_list_lock);
120 atomic_inc(&ctrl->req_seq_no);
121 req->sequence_no = atomic_read(&ctrl->req_seq_no);
122 list_add_tail(&req->list, &ctrl->list);
123 spin_unlock(&ctrl->info_list_lock);
126 /* Compare and remove request */
127 static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
128 struct cfctrl_request_info *req)
130 struct cfctrl_request_info *p, *tmp, *first;
132 spin_lock(&ctrl->info_list_lock);
133 first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
135 list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
136 if (cfctrl_req_eq(req, p)) {
138 pr_warn("Requests are not received in order\n");
140 atomic_set(&ctrl->rsp_seq_no,
148 spin_unlock(&ctrl->info_list_lock);
152 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
154 struct cfctrl *this = container_obj(layer);
158 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
161 info->channel_id = cfctrl->serv.layer.id;
162 info->dev_info = &cfctrl->serv.dev_info;
165 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
167 struct cfctrl *cfctrl = container_obj(layer);
169 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
171 pr_warn("Out of memory\n");
174 caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
175 init_info(cfpkt_info(pkt), cfctrl);
176 cfpkt_info(pkt)->dev_info->id = physlinkid;
177 cfctrl->serv.dev_info.id = physlinkid;
178 cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
179 cfpkt_addbdy(pkt, physlinkid);
181 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
183 pr_err("Could not transmit enum message\n");
188 int cfctrl_linkup_request(struct cflayer *layer,
189 struct cfctrl_link_param *param,
190 struct cflayer *user_layer)
192 struct cfctrl *cfctrl = container_obj(layer);
196 struct cfctrl_request_info *req;
198 char utility_name[16];
199 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
201 pr_warn("Out of memory\n");
204 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
205 cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
206 cfpkt_addbdy(pkt, (param->priority << 3) + param->phyid);
207 cfpkt_addbdy(pkt, param->endpoint & 0x03);
209 switch (param->linktype) {
212 case CFCTRL_SRV_VIDEO:
213 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
217 case CFCTRL_SRV_DATAGRAM:
218 tmp32 = cpu_to_le32(param->u.datagram.connid);
219 cfpkt_add_body(pkt, &tmp32, 4);
222 /* Construct a frame, convert DatagramConnectionID to network
223 * format long and copy it out...
225 tmp32 = cpu_to_le32(param->u.rfm.connid);
226 cfpkt_add_body(pkt, &tmp32, 4);
227 /* Add volume name, including zero termination... */
228 cfpkt_add_body(pkt, param->u.rfm.volume,
229 strlen(param->u.rfm.volume) + 1);
231 case CFCTRL_SRV_UTIL:
232 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
233 cfpkt_add_body(pkt, &tmp16, 2);
234 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
235 cfpkt_add_body(pkt, &tmp16, 2);
236 memset(utility_name, 0, sizeof(utility_name));
237 strncpy(utility_name, param->u.utility.name,
238 UTILITY_NAME_LENGTH - 1);
239 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
240 tmp8 = param->u.utility.paramlen;
241 cfpkt_add_body(pkt, &tmp8, 1);
242 cfpkt_add_body(pkt, param->u.utility.params,
243 param->u.utility.paramlen);
246 pr_warn("Request setup of bad link type = %d\n",
250 req = kzalloc(sizeof(*req), GFP_KERNEL);
252 pr_warn("Out of memory\n");
255 req->client_layer = user_layer;
256 req->cmd = CFCTRL_CMD_LINK_SETUP;
258 cfctrl_insert_req(cfctrl, req);
259 init_info(cfpkt_info(pkt), cfctrl);
261 * NOTE:Always send linkup and linkdown request on the same
262 * device as the payload. Otherwise old queued up payload
263 * might arrive with the newly allocated channel ID.
265 cfpkt_info(pkt)->dev_info->id = param->phyid;
267 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
269 pr_err("Could not transmit linksetup request\n");
276 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
277 struct cflayer *client)
280 struct cfctrl *cfctrl = container_obj(layer);
281 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
283 pr_warn("Out of memory\n");
286 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
287 cfpkt_addbdy(pkt, channelid);
288 init_info(cfpkt_info(pkt), cfctrl);
290 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
292 pr_err("Could not transmit link-down request\n");
298 void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
300 struct cfctrl_request_info *p, *tmp;
301 struct cfctrl *ctrl = container_obj(layr);
302 spin_lock(&ctrl->info_list_lock);
304 list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
305 if (p->client_layer == adap_layer) {
306 pr_debug("cancel req :%d\n", p->sequence_no);
312 spin_unlock(&ctrl->info_list_lock);
315 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
324 struct cfctrl *cfctrl = container_obj(layer);
325 struct cfctrl_request_info rsp, *req;
328 cfpkt_extr_head(pkt, &cmdrsp, 1);
329 cmd = cmdrsp & CFCTRL_CMD_MASK;
330 if (cmd != CFCTRL_CMD_LINK_ERR
331 && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
332 if (handle_loop(cfctrl, cmd, pkt) != 0)
333 cmdrsp |= CFCTRL_ERR_BIT;
337 case CFCTRL_CMD_LINK_SETUP:
339 enum cfctrl_srv serv;
340 enum cfctrl_srv servtype;
348 struct cfctrl_link_param linkparam;
349 memset(&linkparam, 0, sizeof(linkparam));
351 cfpkt_extr_head(pkt, &tmp, 1);
353 serv = tmp & CFCTRL_SRV_MASK;
354 linkparam.linktype = serv;
357 linkparam.chtype = servtype;
359 cfpkt_extr_head(pkt, &tmp, 1);
360 physlinkid = tmp & 0x07;
363 linkparam.priority = prio;
364 linkparam.phyid = physlinkid;
365 cfpkt_extr_head(pkt, &endpoint, 1);
366 linkparam.endpoint = endpoint & 0x03;
371 if (CFCTRL_ERR_BIT & cmdrsp)
374 cfpkt_extr_head(pkt, &linkid, 1);
376 case CFCTRL_SRV_VIDEO:
377 cfpkt_extr_head(pkt, &tmp, 1);
378 linkparam.u.video.connid = tmp;
379 if (CFCTRL_ERR_BIT & cmdrsp)
382 cfpkt_extr_head(pkt, &linkid, 1);
385 case CFCTRL_SRV_DATAGRAM:
386 cfpkt_extr_head(pkt, &tmp32, 4);
387 linkparam.u.datagram.connid =
389 if (CFCTRL_ERR_BIT & cmdrsp)
392 cfpkt_extr_head(pkt, &linkid, 1);
395 /* Construct a frame, convert
396 * DatagramConnectionID
397 * to network format long and copy it out...
399 cfpkt_extr_head(pkt, &tmp32, 4);
400 linkparam.u.rfm.connid =
402 cp = (u8 *) linkparam.u.rfm.volume;
403 for (cfpkt_extr_head(pkt, &tmp, 1);
404 cfpkt_more(pkt) && tmp != '\0';
405 cfpkt_extr_head(pkt, &tmp, 1))
409 if (CFCTRL_ERR_BIT & cmdrsp)
412 cfpkt_extr_head(pkt, &linkid, 1);
415 case CFCTRL_SRV_UTIL:
416 /* Construct a frame, convert
417 * DatagramConnectionID
418 * to network format long and copy it out...
421 cfpkt_extr_head(pkt, &tmp16, 2);
422 linkparam.u.utility.fifosize_kb =
425 cfpkt_extr_head(pkt, &tmp16, 2);
426 linkparam.u.utility.fifosize_bufs =
429 cp = (u8 *) linkparam.u.utility.name;
430 caif_assert(sizeof(linkparam.u.utility.name)
431 >= UTILITY_NAME_LENGTH);
433 i < UTILITY_NAME_LENGTH
434 && cfpkt_more(pkt); i++) {
435 cfpkt_extr_head(pkt, &tmp, 1);
439 cfpkt_extr_head(pkt, &len, 1);
440 linkparam.u.utility.paramlen = len;
442 cp = linkparam.u.utility.params;
443 while (cfpkt_more(pkt) && len--) {
444 cfpkt_extr_head(pkt, &tmp, 1);
447 if (CFCTRL_ERR_BIT & cmdrsp)
450 cfpkt_extr_head(pkt, &linkid, 1);
452 cfpkt_extr_head(pkt, &len, 1);
454 cfpkt_extr_head(pkt, ¶m, len);
457 pr_warn("Request setup - invalid link type (%d)\n",
463 rsp.param = linkparam;
464 req = cfctrl_remove_req(cfctrl, &rsp);
466 if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
467 cfpkt_erroneous(pkt)) {
468 pr_err("Invalid O/E bit or parse error on CAIF control channel\n");
469 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
471 req ? req->client_layer
474 cfctrl->res.linksetup_rsp(cfctrl->serv.
478 client_layer : NULL);
485 case CFCTRL_CMD_LINK_DESTROY:
486 cfpkt_extr_head(pkt, &linkid, 1);
487 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
489 case CFCTRL_CMD_LINK_ERR:
490 pr_err("Frame Error Indication received\n");
491 cfctrl->res.linkerror_ind();
493 case CFCTRL_CMD_ENUM:
494 cfctrl->res.enum_rsp();
496 case CFCTRL_CMD_SLEEP:
497 cfctrl->res.sleep_rsp();
499 case CFCTRL_CMD_WAKE:
500 cfctrl->res.wake_rsp();
502 case CFCTRL_CMD_LINK_RECONF:
503 cfctrl->res.restart_rsp();
505 case CFCTRL_CMD_RADIO_SET:
506 cfctrl->res.radioset_rsp();
509 pr_err("Unrecognized Control Frame\n");
519 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
522 struct cfctrl *this = container_obj(layr);
524 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
525 case CAIF_CTRLCMD_FLOW_OFF_IND:
526 spin_lock(&this->info_list_lock);
527 if (!list_empty(&this->list)) {
528 pr_debug("Received flow off in control layer\n");
530 spin_unlock(&this->info_list_lock);
538 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
540 static int last_linkid;
541 u8 linkid, linktype, tmp;
543 case CFCTRL_CMD_LINK_SETUP:
544 spin_lock(&ctrl->loop_linkid_lock);
545 for (linkid = last_linkid + 1; linkid < 255; linkid++)
546 if (!ctrl->loop_linkused[linkid])
548 for (linkid = last_linkid - 1; linkid > 0; linkid--)
549 if (!ctrl->loop_linkused[linkid])
551 spin_unlock(&ctrl->loop_linkid_lock);
552 pr_err("Out of link-ids\n");
555 if (!ctrl->loop_linkused[linkid])
556 ctrl->loop_linkused[linkid] = 1;
558 last_linkid = linkid;
560 cfpkt_add_trail(pkt, &linkid, 1);
561 spin_unlock(&ctrl->loop_linkid_lock);
562 cfpkt_peek_head(pkt, &linktype, 1);
563 if (linktype == CFCTRL_SRV_UTIL) {
565 cfpkt_add_trail(pkt, &tmp, 1);
566 cfpkt_add_trail(pkt, &tmp, 1);
570 case CFCTRL_CMD_LINK_DESTROY:
571 spin_lock(&ctrl->loop_linkid_lock);
572 cfpkt_peek_head(pkt, &linkid, 1);
573 ctrl->loop_linkused[linkid] = 0;
574 spin_unlock(&ctrl->loop_linkid_lock);